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Low Emission Engines for Heavy-Duty Natural Gas-Powered Urban Vehicles - Development Experience
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1990 by SAE International in United States
Annotation ability available
The evolution and explanation of an approach to achieving a stated set of very low emissions limits was described in a previous paper (1)*. The method outlined was to use stoichiometric mixture preparation with EGR dilution in order to employ a 3-way catalyst for low emissions, whilst giving an engine power output competitive with a turbocharged diesel engine.
This approach has been followed in an engine development programme, which has resulted in a responsive and driveable engine being produced. The engine has demonstrated the achievability of very low emissions over the US heavy duty diesel transient test (FTP) cycle as follows:
The lean-burn approach to low emission heavy duty operation has also been considered, using steady-state engine test results. The NOx-HC trade-off has been identified as a key indicator of engines' potential, and is also considered to give an indication of the accuracy of air-fuel ratio control required to achieve proposed emissions standards.
Results from stoichiometric, naturally aspirated gas engines, indicate that they have potential for low emission operation using 3-way catalysts. Although considered unsuitable for heavy-duty application due to knock and temperature limitations, this type of engine could find use in light-medium duty applications, where greater torque and power then diesel engines and better efficiencies than gasoline engines would be attractive features.
CitationHundleby, G. and Thomas, J., "Low Emission Engines for Heavy-Duty Natural Gas-Powered Urban Vehicles - Development Experience," SAE Technical Paper 902068, 1990, https://doi.org/10.4271/902068.
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